Their new job is to haul a giant gun around with four other horses: Heinie, who must be the butt of all jokes; Coco, who puts the you know what in horse's you know what with his baditude; and two golden Haflingers who don't have names.
The horses have to work in horrible conditions, trudging through deep mud that rubs raw the skin on their lower legs.
Both Heinie and Coco are killed, Heinie by illness and Coco by flying shrapnel.
Even strong Topthorn gets ill, and comes down with a brutal cough. We hope this cough doesn't mean the same thing as every other cough in literature and movies: certain death!